samples 遗传系谱

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1、AmanwithaMendeliansyndromemarriesanormalwoman.Oftheir9children,all4boysarenormal,whereasall5daughtersareaffectedbythesamesyndrome.Whatisthemostlikelyinheritancepatternforthissyndrome?A.autosomaldominantB.autosomaldominantwithfemalepreponderanceC.X-linkeddominantD.Y-linkedE.autosomalrecessiveC

2、AcouplehasafemalechildwithTaySachsdisease,andthreeunaffectedchildren.Neitherparentnoranyofthefourbiologicalgrandparentsoftheaffectedchildhashadthisdisease.ThemostlikelygeneticexplanationisthatTaySachsdiseaseisinheritedasa(n)______________disease.A.autosomaldominantB.autosomalrecessiveC.sex-li

3、nkedrecessiveD.sex-linkeddominantE.cannotmakeareasonableguessfromthisinformationBThealleleforbrowneyesisdominanttothealleleforblueeyes.Eyecolorisonanautosomalchromosome.Howcouldabrown-eyedmanandabrown-eyedwomanhaveablue-eyedchild?A.Theycouldbothbehomozygous.B.Theycouldbothbeheterozygous.C.T

4、hemancouldbehomozygousandthewomanheterozygous.D.Thewomancouldbehomozygousandthemanheterozygous.E.canddonlyBAgeneontheYchromosomecontrolsthelengthofhaironmen'sears.Awomanmarriedtoamanwithhairyearshasthreechildren.Thefirsttwoaredaughterswithhairlessears.Thethirdisason.Whatistheprobabilityhewi

5、llhavehairyears?A.zeroB.25%C.50%D.75%E.100%EAgenethatdeterminescolorperceptionisontheXchromosomeofhumans.Thedominantalleleconferscolorvision;therecessiveleadstocolorblindness.Aheterozygouswoman,withnormalcolorvision,marriesamanwithnormalcolorvision.Whatistheprobabilitythattheirsonwillbecolorb

6、lind?A.zeroB.one-quarterC.one-thirdD.one-halfE.two-thirdsDTheMNbloodgroupinhumanshastwoalleles,MandN.Thetwoallelesofthisautosomalgeneareexpressedcodominantly.AmanofbloodtypeMmarriesawomanofbloodtypeN.WhatistheprobabilitythattheirchildwillhavebloodtypeMN?A.0%B.25%C.50%D.75%E.100%EOneofMary’sbr

7、othersandamaternalunclearecolorblindforredandgreen.Noothersinherfamilyareknowntobeaffected,includingherparents,anotherbrotherandhersister.FromthemostlikelypatternofMendeliantransmissionthatcanaccountforthisdisorder(XRdisease),whatisthelikelih